Ingredient review
Methionyl SH-Polypeptide-101
INCI: METHIONYL SH-POLYPEPTIDE-101
A synthetic peptide that may help support collagen and improve skin firmness, but research is still emerging and results vary.
In plain English
This is a lab-made peptide, which is a small chain of amino acids (the building blocks of proteins). In skincare, peptides are used as signals to encourage skin cells to behave more youthfully, such as producing more collagen. Methionyl SH-Polypeptide-101 is a specific peptide designed to be stable and effective in creams and serums, but it's still a newer ingredient with limited independent studies.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is still emerging, so marketing claims deserve extra caution.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- emerging
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Methionyl SH-Polypeptide-101 is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Methionyl SH-Polypeptide-101.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
A synthetic peptide, specifically a polypeptide modified with methionine and a thiol group, designed to mimic natural signaling molecules in the skin.
How it works
It is thought to bind to receptors on skin cells and stimulate processes like collagen synthesis and cell repair, which can help improve skin firmness and reduce the appearance of wrinkles over time.
Pros
Low irritation risk
Generally well-tolerated even by sensitive skin, making it a gentle anti-aging option.
Targeted signaling
Designed to mimic natural peptides, potentially offering more specific skin benefits than generic moisturizers.
Cons and cautions
Emerging evidence
Most research is from ingredient suppliers; independent peer-reviewed studies on this specific peptide are limited.
Gradual results
Visible improvements in firmness and wrinkles typically take weeks to months of consistent use.
Best for
- People looking for anti-aging benefits with low irritation risk
- Those who want to complement retinol or vitamin C with a peptide
Use caution if
- Anyone with a known allergy to synthetic peptides (rare)
- Those seeking immediate, dramatic results (peptides work gradually)
Usage tips
Safety summary
Considered safe for topical use at typical concentrations. No significant safety concerns have been reported, but long-term data on this specific peptide is limited.
Research notes
Research on SH-Polypeptide-101 is primarily from manufacturer studies showing potential collagen-stimulating effects. More independent clinical trials are needed to confirm efficacy and compare with other peptides.
Common label clues
- Typical concentration
- Typically used at 0.1% to 1% in leave-on products
- Regulatory status
- Approved for cosmetic use in the US and EU as a skin conditioning agent; not classified as a drug.
- Common uses
- Anti-aging serums, Firming creams, Eye treatments
- Environmental note
- Synthetic peptides are produced in labs, which reduces the need for animal-derived ingredients but may involve energy-intensive processes.
Good to know
- Peptides are often combined with other anti-aging ingredients like niacinamide or antioxidants for synergistic effects.
- The 'SH' in the name refers to a thiol group, which may help with stability and activity.
Common questions
What is Methionyl SH-Polypeptide-101 in beauty products?
This is a lab-made peptide, which is a small chain of amino acids (the building blocks of proteins). In skincare, peptides are used as signals to encourage skin cells to behave more youthfully, such as producing more collagen. Methionyl SH-Polypeptide-101 is a specific peptide designed to be stable and effective in creams and serums, but it's still a newer ingredient with limited independent studies.
What does Methionyl SH-Polypeptide-101 do in a beauty product?
It is thought to bind to receptors on skin cells and stimulate processes like collagen synthesis and cell repair, which can help improve skin firmness and reduce the appearance of wrinkles over time.
Is Methionyl SH-Polypeptide-101 safe for most people?
Considered safe for topical use at typical concentrations. No significant safety concerns have been reported, but long-term data on this specific peptide is limited.
Who should be careful with Methionyl SH-Polypeptide-101?
Anyone with a known allergy to synthetic peptides (rare) Those seeking immediate, dramatic results (peptides work gradually)
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.